This week has seen major falls in share prices across the world with $6 trillion being wiped off world share values. America’s Dow Jones index dropped 5.2%, Japan’s Nikkei index fell 8.1% and the UK’s FTSE index fell 4.7%, the lowest it has been for 15 months, while in Japan and America the falls broke records for the size of their drop since October 2008.
The initial reason for the fall was, paradoxically, good US economic data as their service sector boomed and wage levels grew at the fastest rate since the start of the decade. This good news meant that it is now more likely that US interest rates will rise sooner and by more than had previously been anticipated. Mark Carney reinforced this view when he expressed similar sentiments about the future of UK interest rates.
Although a rise in interest rates has been expected for some time as the world economy’s growth accelerated, the reminder that it might occur soon has come as an unpleasant shock. The scaling back of QE by central banks is expected to reduce the ability to borrow cheaply, some of which has financed recent purchases in shares. Financial investors expect that the forthcoming rise in interest rates will reduce company profits, therefore reducing the demand for shares. Simultaneously existing shareholders might be encouraged to sell quickly before prices fall further, thereby increasing the excess demand. In addition, the economic uncertainty was increased by the fall in the value of bitcoin by approximately 50% since the state of the year.
Economists are trying to decide whether we are currently experiencing a “correction” or are entering a bear market, where prices fall by more than 20%. The “correction” proponents believe that shares are over-priced in terms of their price compared to their earnings – the price:earnings ratio – and therefore the fall was due. However there is concern that the behaviour of investors, whether in shares, currencies or commodities, sometimes leads to markets over-shooting since falls (increases) in price encourage selling (buying) which further reduces (increases) the price.
According to economic theory, the fall in share prices might lead to a negative wealth effect (the idea that consumption is determined by one’s wealth as well as one’s income). However, given that many shareholders are in the upper income brackets, their marginal propensity to consume will be low and therefore the effect will small. More significant might be the general impact on consumer and business confidence from the media reports about the falling share prices. As Keynes wrote in his General Theory, “animal spirits” outweigh the “weighted average of quantitative benefits multiplied by quantitative probabilities.”.